we are learning more about the departure of cia director david petraeus. the retired general resigned after publicly admitting to an extramarital affair. >> the sudden fall of cia chief david petraeus has washington asking how and why. and the woman suddenly in the spotlight, is not saying. back in january, she was promoting her book on the general. >> he loves the agency. i think it is a great place for him. >> she is an army reserve officer in that close access to the cia director. federal agents are investigating whether she had access to this e-mails or computer. >> mike understanding is that the fbi's investigation was not necessarily focused on him. they came by the permissible accident. >> law enforcement and multiple sources tell nbc news that males between him paula were indicative of an extramarital affair. she was unable to be reached for comment. in his resignation letter, the retired general revealed he showed extremely judgment by engaging in an extramarital affair. law-enforcement tells us that general petraeus is not under investigation. th